I bought it to replace the bearing for the swing arm of the motorbike.
Because the price is cheaply cheaper than genuine parts, there was also an uneasy part whether it was overseas products, but I was relieved because it was made in Japan.

It is used as a roller stylus for detecting dial gauge runout attached to the bicycle wheel sway base. Rolling measurement rollers require a certain width (about 10 mm), Mitutoyo roller measuring element is too narrow to use. (It is possible for lateral runout) This bearing is a rotating body through an IR type inner ring through an L type aluminum bracket through an M5 bolt, and an outer ring is brought into contact with a wheel as a roller measuring element. Rotation can also be performed smoothly, and it can be used without problem for detecting the runout of the wheel. By devising one device, you can make your own roller measuring element which is not available in the standard product.